Small things I noticed:
* The artist title is now displayed diagonally in the Music app if you don't have album artwork.
* A Google Chrome like bookmarks "page" with buttons in Safari.
* Number of unread messages now in Mail (at the very bottom) below how long it's been since the mailbox was refreshed.
* Text Size slider actually changes text size now.

Wait, it wiped your music and it takes forever to sync with iTunes?
Is anybody else experiencing this?
I'm watching it download OTA now..

It's syncing now (on my Mac) and putting all my music back on. At least it's working sometimes now, on b1 I couldn't get it to sync at all.
*EDIT* I also noticed that it's now displaying all my album art correctly in the music app. On b1 it was displaying the wrong album art randomly for certain albums.

The music player's inability to shuffle all music and the band discographies? (I know you can do it by using Siri, but it's a little tricky compared to pressing a button).

The confusing calendar, where you'll have to scroll through the day to see any appointments? Furthermore its hard to keep track of which days you have appointments, which is of course nice to see if you need to quickly find an available day

I could probably find more, but this is what really makes me irritated.

The music player's inability to shuffle all music and the band discographies? (I know you can do it by using Siri, but it's a little tricky compared to pressing a button).

The confusing calendar, where you'll have to scroll through the day to see any appointments? Furthermore its hard to keep track of which days you have appointments, which is of course nice to see if you need to quickly find an available day

I could probably find more, but this is what really makes me irritated.

I can see that being an issue, however personally I don't use my iPhone for music, but use and 3rd party app for calendar, notes, tasks and appointments. I usually find installed-default apps only work "a-bit" to make you want more.

The music player's inability to shuffle all music and the band discographies? (I know you can do it by using Siri, but it's a little tricky compared to pressing a button).

The confusing calendar, where you'll have to scroll through the day to see any appointments? Furthermore its hard to keep track of which days you have appointments, which is of course nice to see if you need to quickly find an available day

I could probably find more, but this is what really makes me irritated.

I'm more annoyed that in landscape your cover art is random instead of being arranged a-z.

I can see that being an issue, however personally I don't use my iPhone for music, but use and 3rd party app for calendar, notes, tasks and appointments. I usually find installed-default apps only work "a-bit" to make you want more.

Music is one of the things i use my iPhone for the most
And i have downloaded a 3rd party app now, but only in iOS 7. i loved the calendar in iOS 6...

But i wonder why Apple have changed something that works great (in my opinion) , to something being a-pain-in-the-***...